(19)
(11) EP 2 000 455 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
01.12.2010 Bulletin 2010/48

(43) Date of publication A2:
10.12.2008 Bulletin 2008/50

(21) Application number: 08015804.1

(22) Date of filing: 23.06.2006
(51) International Patent Classification (IPC): 
C07C 67/303(2006.01)
C07C 45/51(2006.01)
C07C 49/647(2006.01)
C07C 67/475(2006.01)
C07C 69/738(2006.01)
C07D 307/33(2006.01)
 C07C 45/41(2006.01)
C07C 49/395(2006.01)
C07C 67/31(2006.01)
C07C 69/716(2006.01)
C07D 303/04(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

(30) Priority: 30.06.2005 JP 2005191368
11.08.2005 JP 2005232933
29.08.2005 JP 2005247039
07.11.2005 JP 2005321789

(62) Application number of the earlier application in accordance with Art. 76 EPC:
06780642.2 / 1900720

(71) Applicant: Asahi Kasei Chemicals Corporation
Tokyo 101-8101 (JP)

(72) Inventors:
  • Shimizu, Katsuya
    Chiyoda-ku Tokyo 101-8101 (JP)
  • Matsushita, Fumio
    Chiyoda-ku Tokyo 101-8101 (JP)

(74) Representative: Bradley, Josephine Mary et al
D Young & Co LLP
120 Holborn London EC1N 2DY
120 Holborn London EC1N 2DY (GB)

   


(54) Process for production of substituted cyclopentanone


(57) A process for producing a substituted cyclopentenone wherein the process comprises nine steps, the first step of which is a step of etherifying 1,3-cyclopentanedione to produce a compound represented by the following formula (21):

(wherein R32 represents a hydrogen atom or a substituent having 1 to 8 carbon atoms). This process can produce a substituted cyclopentanone which is useful as a jasmine fragrance, an intermediate thereof or the like, in a simple and inexpensive manner at a high cis-isomer ratio.





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